1.) download & extract XnView MP 0.39
2.) Create an 'xnview.ini' in the same extracted program folder(s)
3.) Run the program, open an image file in viewer (from Win Explorer)
4.) Click on 'Browser' to be taken to the sync'd browser directory of the same file opened
5.) Now right-click on the folder tree of the folder and do a "Add to favourites"
6.) Program crash!!

Windows 7 sp1 | XnView MP 0.39 -x86